I want to repeat the COMSOL simulation in water imbibition in a paper matrix using the Richard's equation as reported in Article Two-dimensional model of imbibition into paper-based network...
.When I started the modelling, I was stucked at a point where I cannot find the right place to input the boundary conditions in the Richard equation module, where the water fraction is saturated in the nodes at the bottom of the geometry.
Can anyone suggests me a way to solve this problem or guide me an article/tutorial to read?